mapChatMessagesToModelMessages (ai-sdk/messages.ts)

Module exposing: mapChatMessagesToModelMessages

// Source: https://github.com/langfuse/langfuse | License: MIT | Copyright 2023-2026 ClickHouse, Inc
// Provided via justclaw.it.com; keep this notice with the code.
import type { AssistantContent, ModelMessage } from "ai";

import { LLMValidationError } from "../errors";
import {
  ChatMessage,
  ChatMessageRole,
  ChatMessageType,
  LLMAdapter,
  LLMToolCall,
  PROVIDERS_WITH_REQUIRED_USER_MESSAGE,
} from "../types";

// Helper function to safely stringify content
const safeStringify = (content: unknown): string => {
  try {
    return JSON.stringify(content);
  } catch {
    return "[Unserializable content]";
  }
};

const toSafeContent = (content: unknown): string =>
  typeof content === "string" ? content : safeStringify(content);

/**
 * Maps persisted/playground Langfuse `ChatMessag

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